India

Hong Kong

Italy

Japan

Sweden

ITM Sweden (Swedish Reference Laboratory)University of Lund

Switzerland

World Meteorological Organisation, Geneva (for use in Indonesia & Malaysia)

Taiwan

Le & Der Ltd Taipei Taiwan

U.S.A.

Maryland Department of the EnvironmentDesert Research Institute Tejon Ranch Air Monitoring Station Tucson Power University of CaliforniaColorado State University SCRIPPS Institute San Diego and Colorado State UniversityTexas Commission of Environmental Quality Puget Sound Clean Air Authority